Lighting system for locomotives.



No. 759,511. I PATENTED MAY 10, 19.04.

E. T. FORD.

LIGHTING SYSTEM FOR LOCOMOTIVES.

APPLICATION TILED DEC. 21- 1903. O

NO MODEL.

Fig. 1.

gVitnesses: lnventorz' 2'. m

my I By M Attorneys.

UNITED STATES Patented May 10, 1904..

PATENT OFFICE.

ETHELBERT T. FORD, OF ST. LOUIS, MISSOURI, ASSIGNOR TO PETER H MURPHY, OF ST. LOUIS, MISSOURI.

LIGHTING SYSTEM FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. '7 59,51 1, dated May 10, 1904.

Application filed December 21, 1903. Serial No. 186,002. (No model.)

To all whom it may concern:

from a common dynamo; to so arrange the headlight-circuit, cab-light circuit, and fieldcoils of the dynamo that the headlight-circuit may be opened without extinguishing the cab lights; to so arrange the circuits and fieldcoils of the dynamo that the field will not be destroyed by opening the headlight-circuit; to furnish current to an arc-headlight and incandescent cab-lights from a dynamo driven by an independent motor, the circuits and field-coils being so arranged that the potential for the cab-lights will be maintained when the headlight-circuitis open, and other objects hereinafter more fully appearing.

In the accompanying drawings, forming a part of this specification, and wherein like symbols refer to like parts wherever they occur, Figure 1 is a view of a locomotive equipped with my improved system, the cab and head light being shown in section. Fig. 2 is a plan view of the locomotive, the cab being shown in section; and Fig. 3 is a conventional illustration of the circuits.

In electric-lighting systems as applied to locomotives it is desirable to furnish current to the headlight, which is usually an arc-light, and to the cab-lights, which are usually incandescent lights, from a single dynamo. For the arc-light it is desirable to use a serieswound dynamo. At times it is necessary to extinguish the headlight, and it is desirable to do this without extinguishing the cablights. secured.

A steam-motor 1, of any desired type, and a direct-connected dynamo2 are mounted upon the locomotive in proximity to the headlight By my system all these desiderata are of the arc-light.

3. The steam-motor 1 is driven by steam drawn from a receiver 4 in the smoke-box of the locomotive. The receiver is supplied with exhaust-steam from an air-pump 5, conducted through a pipe 6. A pipe 7 also leads to the receiver, through which steamfrom the boiler may be introduced. When the air-pump is running, the steam-motor is driven by eX- haust-steam and at other times by live steam. For further details of this equipment reference is made to my copending application for patent on improvements in electric headlight equipment for steam-locomotives filed April 22, 1903, Serial No. 153,794..

The headlight 3 is provided with an an arelight. The cab is equipped with incandescent lights 8. Conductors 9 10 lead from the dynamo .Zto the cab-lights 8. A conductor 11 leads from one terminal of the dynamo directly to one terminal of the arc-light. .A conductor 12 leads from the other terminal of the dynamo to a switch 13, located in the cab of the engine in position to be conveniently reached by the engineer. A conductor 14 leads from the switch to the other terminal The dynamo-is provided with two field-coils, one of them, 15, is in series with the head-light circuit, the other, 16,

is directly connected to the terminals of the dynamo.

When the engineer opens the switch 13 and thus extinguishes the headlight, the field-coil 15 ceases to energize the field. The field-coil 16, however, continues to receive current, as it is not in series with the headlight. A field is thus maintained, though a somewhat weakened one. The steam-motor will speed up immediately upon the removal of the load due to the headlight. The field-coil 16 is so proportioned that the increased speed of revolution will compensate for the weakened field and thus maintain the normal electromotivei'orce. Thus the cab-lights can continue in operation whether the headlight is extinguished or not.

The system is capable'of modification within the scope of my invention, and therefore I do not wish to be limited to the specific features shown and described.

What I claim is- 1. A lighting system for locomotives comprising a circuit including incandescent lights located in the locomotive-cab, a second circuit including a switch and a headlight equipped with an arc-light, an independent motor, a dynamo operatively connected thereto and having two sets of field-coils, one set of field-coils being included in the headlight-circuit and the other set being connected across the terminals of the dynamo, the ratio of the ampere-turns of the two sets of field-coils together to the ampere-turns of the latter set of field-coils being substantially inversely proportional to the ratio of the speed of revolution when both circuits are closed to the speed revolution when the headlight-circuit is open.

2. A lighting system for locomotives comprising a dynamo having a plurality of fieldcoils certain of said coils being connected across the terminals thereof, an independent motor for said dynamo the speed of revolution of which is influenced by the load upon it, a circuit leading from said dynamo and including other of said field-coils, a switch located in the locomotive-cab and a headlight equipped with an arc-light, and a second cir cuit leading from said dynamo and including incandescent lights located in the locomotive cab. v

3. A lighting system for locomotives comprising a headlight provided with an arc-light, incandescent lights located in the locomotive cab, a dynamo located on the locomotive in proximity to said headlight and provided with a plurality of field-coils, certain of said fieldcoils being connected to the terminals of the dynamo, a circuit connecting said dynamo with said headlight and including other of said field-coils and a switch located in the cab of the locomotive, and a second circuit connecting said dynamo with said incandescent cab-lights.

4. A lighting system for locomotives comprising a headlight provided with an arc-light, a dynamo located on the locomotive in proximity to said headlight and provided with two sets of field-coils, a circuit connecting said dynamo and headlight and including one of said field-coils and a switch located in the locomotive-cab within convenient reach of the locomotive-engineer,and a second circuit including incandescent lights located in the locomotivecab.

5. A lighting system for locomotives comprising a headlight, a dynamo located on the locomotive in proximity to said headlight and having two sets of field-coils, a switch located in the locomotive-cab, a light located in the locomotive-cab, a circuit from said dynamo containing one of said sets of field-coils, said switch and said headlight, and a second circuit from said dynamo in parallel with said first-named circuit and containing said cablight, whereby the headlight may be extinguished without extinguishing the cab-light.

6. A lighting system for locomotives comprising a dynamo having two sets of field-coils, a circuit containing an arc-light in the locomotive-headlight and a switch located in the locomotive-cab within convenient reach of the locomotive-engineer, and a second circuit containing incandescent lights located in the 10- comotive-cab, one of said sets of field -coils being shunted across said cab-light circuit and the other set being arranged in series with said headlight-circuit.

In witness whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 19th day of December,

ETHELBERT T. FORD. Vitnesses:

FRED F. REISNER, J. B. MEoowN. 

